ant-design/components/menu/MenuItem.tsx

import * as React from 'react';
import { Item, MenuItemProps as RcMenuItemProps } from 'rc-menu';
import toArray from 'rc-util/lib/Children/toArray';
import classNames from 'classnames';
import MenuContext, { MenuContextProps } from './MenuContext';
import Tooltip, { TooltipProps } from '../tooltip';
import { SiderContext, SiderContextProps } from '../layout/Sider';
import { isValidElement, cloneElement } from '../_util/reactNode';

export interface MenuItemProps extends Omit<RcMenuItemProps, 'title'> {
  icon?: React.ReactNode;
  danger?: boolean;
  title?: React.ReactNode;
}

export default class MenuItem extends React.Component<MenuItemProps> {
  static contextType = MenuContext;

  context: MenuContextProps;

  renderItemChildren(inlineCollapsed: boolean) {
    const { prefixCls, firstLevel } = this.context;
    const { icon, children } = this.props;

    const wrapNode = <span className={`${prefixCls}-title-content`}>{children}</span>;
    // inline-collapsed.md demo 依赖 span 来隐藏文字,有 icon 属性，则内部包裹一个 span
    // ref: https://github.com/ant-design/ant-design/pull/23456
    if (!icon || (isValidElement(children) && children.type === 'span')) {
      if (children && inlineCollapsed && firstLevel && typeof children === 'string') {
        return <div className={`${prefixCls}-inline-collapsed-noicon`}>{children.charAt(0)}</div>;
      }
    }
    return wrapNode;
  }

  renderItem = ({ siderCollapsed }: SiderContextProps) => {
    const { prefixCls, firstLevel, inlineCollapsed, direction } = this.context;
    const { className, children } = this.props;
    const { title, icon, danger, ...rest } = this.props;

    let tooltipTitle = title;
    if (typeof title === 'undefined') {
      tooltipTitle = firstLevel ? children : '';
    } else if (title === false) {
      tooltipTitle = '';
    }
    const tooltipProps: TooltipProps = {
      title: tooltipTitle,
    };

    if (!siderCollapsed && !inlineCollapsed) {
      tooltipProps.title = null;
      // Reset `visible` to fix control mode tooltip display not correct
      // ref: https://github.com/ant-design/ant-design/issues/16742
      tooltipProps.visible = false;
    }
    const childrenLength = toArray(children).length;
    return (
      <Tooltip
        {...tooltipProps}
        placement={direction === 'rtl' ? 'left' : 'right'}
        overlayClassName={`${prefixCls}-inline-collapsed-tooltip`}
      >
        <Item
          {...rest}
          className={classNames(
            {
              [`${prefixCls}-item-danger`]: danger,
              [`${prefixCls}-item-only-child`]: (icon ? childrenLength + 1 : childrenLength) === 1,
            },
            className,
          )}
          title={typeof title === 'string' ? title : undefined}
        >
          {cloneElement(icon, {
            className: classNames(
              isValidElement(icon) ? icon.props?.className : '',
              `${prefixCls}-item-icon`,
            ),
          })}
          {this.renderItemChildren(inlineCollapsed)}
        </Item>
      </Tooltip>
    );
  };

  render() {
    return <SiderContext.Consumer>{this.renderItem}</SiderContext.Consumer>;
  }
}